The act of inserting one's penis and balls into his own anus at the same time. Impossible, just like the possibility of an honest politician ever existing.
Jim: So, Tom what did you do last night?
Tom: I labored for hours and hours trying to give myself The Honest Politician.
Jim: The Honest Politician? What the fuck is that?
Tom: You know, it's when you try to put your own cock and balls up your own ass at the same time.
Jim: Oh, I get it. That shit's impossible, kind of like finding an honest politician.